In general, let VLFEATROOT denote the path to the
directory where you unpacked VLFeat. To compile and link your C
program against VLFeat, include in your C source code the appropriate
files from the VLFEATROOT/vl hierarchy and link against
the library vl located in the appropriate
subdirectory vlfeat/bin/ARCH, where ARCH
depends on your architecture.

VLFeat is a C library. To use it from a C++ program, do not forget
to enclose your #include statements in a extern
"C" block.